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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5e619c2a2aeafec358c0d89507fc4f4163727e45d0a432583a7fdbfcc12cbd3' 
  AND token = 'MC4T82GfYx0fojpo9zyw/tayYaGhbetFB2D38eqX3D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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