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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0362c2a585de8ba8a52e8489ce669a0d5294a017a4acef966cb02f7159a2afd7' 
  AND token = 'mnPOnVD4wcDk9FHAuGixYHzpgrNhDkSH2Y9ItFJLxQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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