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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd019c5d04afb6fbcd8caf3fc9b535bc1d2c6e345629245afb1d40da7b1921833' 
  AND token = 'O4dKMi+0iwAspxLchQcmIF3DUyjYKe0pgERLLV/r8Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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