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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75bcd43d0263a73840ad967cce93befc214e8d24b436bfa1137a6a86ecc68b3e' 
  AND token = 'kTasAWLXYoQg7GsB+Z7sjjaatM+ND17DxDboUq2+gaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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