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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9de0ba2f88b84a5f2760a9aae8d51cf536d37531906d9300ac798660c18d4df' 
  AND token = 'c6e5goLrqQmFEgoONopNfkZwTZ1pz30Mx6xupTIIs08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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