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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b983785a0c9f4860e61f98a04f3ee862d2d041a5f97c25019cb800c81a83ffe2' 
  AND token = 'oSxxBqlwYW50+MalFO/5BxvpNArbTlu9Du+1fSDxyIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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