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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba2f296d9fee23e562920c3ded2e3344cd8bbea7963807f68d29beb12aa3b7ac' 
  AND token = 'dCG+FE8SsDVYNJiy5e+cNI70uEm6A1a0ADPWfMpejkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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