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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c58ed9848623b011a93a2330668e54687d0968c07dd39c2a966c0b1d309bc585' 
  AND token = 'uj2US77YO9bQdrURWLZqvjCocArevn21dDMU8hWqDeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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