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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4dc9093fe14ca047d0b3829d3bc6de2a281d87ea0f0833a0db9923ccf583b70' 
  AND token = 'yBNF2GywNWTawxveQIGCUDjXG5iLhgD6hALIyfAj9LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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