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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62f3bc94aec5684abdeee0385f2b39dd91a3138620c903140003aeb9bad8584c' 
  AND token = 'PhLBj+ix16cHrtkU9Y07MhIKiMn3M1S93kfjfd3K9fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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