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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf9596458651b40371cafe6001578d82117dd1681c1cc43a0e6ed228e349bb4c' 
  AND token = 'xqi2+VfzR1h8fPaXHotMFTpTjh4uWO6gGQi/+ePIl74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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