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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '948e0e802723fc6995268608850476e1a2701628a436d7e5e43863029c1c5a1b' 
  AND token = 'N9z3yUpr0g7wxRdm3PDW0d6azjNwYLILvBbgEYzxkKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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