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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca2cd5e5a7e1b2447b76fca41626a99e1650f0a67535c5f640b39535be6e2e80' 
  AND token = 'y2rbPK/fpDHCWkieldFsyF6HvCItN/4RHx6LtzkK9EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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