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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '900623bbed05035f56db4c34ea2eeb256e051dca3b1052ea0e99d645e3ac2a66' 
  AND token = 'XS8pfLHxpiTQ0LUmx+jWEaMnLOSlhtb2QOfEVGbUG7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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