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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd268bbbed46d3428289f5f7c7b8f1dab84a6ecca8ab2983227734ac940d71ac9' 
  AND token = 'cOX6vnM0XpP5oSQb+O7uiiWDSLtyIcXXdEwBrRyk6N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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