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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffea79c2c8475334a0b12c7adbacc5546865470579b9695a4ec3e546579c5b4a' 
  AND token = 'RzzD93KDtHTpR4Nuz9ZF2+sGCuP0K1GI4hHwAPlPixQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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