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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4744569c409fbce54a634c77515dd844a107c93e309af37597b0872b4d5f32d' 
  AND token = '/uZjIRmH2+klHc5WnGGrcfuou0icO87Nr3zo/Bp7pGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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