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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7737e2601766c440261035529494e2188c6b0b2bc06dc37ddb07ebba66f34aae' 
  AND token = 'C1By5XXsSKtvqP4TB+1U1KWpm2VubXrQVSVzTUvTwcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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