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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea942f20be3171692a34c6867277d2b4173de14b1c22c87c469a217272ac52cd' 
  AND token = 'XOdfybc75dfG0KC6O0u1Lv5ngGBFYY7BZgjh76m/bqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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