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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deedf77122a45c920349ee549f4f0dd6711cea4743d27eeacbf3eb6cd1315022' 
  AND token = 'EXHpmwZzMne4qD7cG/44GL0mbIHe1hBHawKaBp+Ur/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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