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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb499906ffda2bcf56a93ef48c473a828e5f012ae519a2d2950beb693786f0e5' 
  AND token = 'Co4RbdQJL3J/XFeT4BIaclx2Masn33lHzcgAs1iC+eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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