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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec6ca4552365f022b6a37c72c75747b5b36ae5fb02406daf19f86c65825964a7' 
  AND token = 'KUJ/3aRG46N2N312XhfUT1M1TUpSSNBtX2v6Ih95XUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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