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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dea3bb36ad9794af1b46e7fde7e60fb7336679fb02b0007332046ccadb597820' 
  AND token = '6Z8aGpkBRZ6Nu2Y4l/zIj+Rq1Ivx73AKk4Fm7gEqm5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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