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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a74cfe9a8b493f4fc1752b7bc9d8254bbffe01255699c3f8f02131b0a3878c6' 
  AND token = 'vNdMAhVW5FehSPURkHiKlUdfLUeuV3so/x35UrbceFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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