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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3093d34f7fb0296c58221f6e1029ec49f0bdee2f1a2a41c1bc4b0490d221fef9' 
  AND token = 'P9e9Ehor1Icj/VrCPimc2xCHc7vycxQX6BZvQ2KisC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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