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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '983f5d8f3527afab53fec064e9dfcb52d3e8b4bd1fa610b61fc58f32ac66ea3e' 
  AND token = 'mObf+fQZtu3kMmmoKmtC6fHhJA1UisrN34p4jy1adKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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