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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68bda9975a27dbe3d8f1af250cafb5fb9929f3efbd2c100c4925e5145c234c11' 
  AND token = 'p7mqqbPYACkjsc4aeftDgx4La4yTjQz5s0zmKsanCzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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