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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b82c95b50eb5f50a6c835e98dcce5f968320c01d000de844ee3965431e5b7f5' 
  AND token = 'JEsqskGhX64g7QfYvCNXkMrxhctQS5pbTjeclHfdE6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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