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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '275de54f1019868161424c1c4670eaeea8bdf46260ae6890c685fdf3e41b6d9f' 
  AND token = 'Em3roKJucfPt3gWPmy+I0duzEIANqN6EuAmmnFvL0u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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