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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b125f04bca085d9fe2cf1a1200fb100b8edca8c2016519b10c0435b9d630c73' 
  AND token = 'kSS91eK1uRzvj8PcwSSc9k8ow5I9YR5ylJ/UvYK7d8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}