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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f2a05eb06526de0e50867f67a7392b41d13cab39680c05fd0bb49fb0274eca' 
  AND token = 'Uniev3kR8sNX1rp6JeglgSZ1KrLQERS8lyMzyZL+2AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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